it'simportant/necessary.+that后面该怎么加虚拟语气
包含命令、建议、请求类动词和 重要、必要、需要类形容词的形式主语的句子，Should 要加动词原形 do/be等，同时should 可以省略。
odered/necessary/required/improtant
It's important that somthing (should) be done.
It is necessary that we (should） hold a meeting today.
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